Code 23: Intake Air Temperature (IAT) Sensor Circuit (Non-Scan)
(1 of 2)
1
•
•
•
DISCONNECT IAT SENSOR.
IGNITION “ON,” ENGINE STOPPED.
CHECK VOLTAGE BETWEEN IAT SENSOR HARNESS TERMINALS
USING A DIGITAL VOLTMETER.
4
VOLTS OR OVER
BELOW 4 VOLTS
2
•
CHECK RESISTANCE ACROSS IAT SENSOR
TERMINALS. SHOULD BE LESS THAN 25,000
OHMS, SEE TABLE FOR APPROXIMATE
TEMPERATURE TO RESISTANCE VALUES.
•
CHECK VOLTAGE BETWEEN HARNESS CONNECTOR
SIGNAL CIRCUIT AND GROUND.
OK
NOT OK
4 VOLTS OR OVER
BELOW 4 VOLTS
CHECK FOR SIGNAL CIRCUIT BEING
SHORTED TO VOLTAGE. IF NOT
SHORTED TO VOLTAGE, CODE 23 IS
INTERMITTENT.
REPLACE
SENSOR
FAULTY SENSOR GROUND CIRCUIT
OR
FAULTY CONNECTION(S)
OR
OPEN SIGNAL CIRCUIT
OR
FAULTY CONNECTION
OR
FAULTY ECM.
FAULTY ECM.
IAT SENSOR
TEMPERATURE TO RESISTANCE VALUES
(APPROXIMATE)
°
F
°C
100
70
38
20
4
-7
-18
-40
OHMS
185
450
1,800
3,400
7,500
13,500
25,000
100,700
210
160
100
70
40
20
0
-40
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-91
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
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